<template>
	<view>
		<view class="search-box">
			<uni-search-bar @input="input" :radius="100" cancelButton="none" ></uni-search-bar>
		</view>
		
		<!-- 搜索建议列表 -->
		<view class="sugg-list" v-if="searchResults.length !==0">
			<view class="sugg-item" v-for="(item, index) in searchResults" :key="index" @click="gotoDetail(item)">
				<view class="goods-name">{{item.goods_name}}</view>
				<uni-icons type="right" size="18"></uni-icons>
			</view>
		</view>
		
		<!-- 搜索历史 -->
		<view class="history-box" v-else>
			<!-- 上 标题区-->
			<view class="history-title">
				<text>搜索历史</text>
				<uni-icons type="trash" size="18" @click="clean"></uni-icons>
			</view>
			<!-- 下 历史列表 -->
			<view class="history-list">
				<uni-tag :text="item" v-for="(item, index) in historyList" :key="index" @click="gotoGoodsList(item)"></uni-tag>
			</view>
		</view>
		
	</view>
</template>

<script>
	export default {
		data() {
			return {
				timer: null,
				kw: '',
				// 搜索 结果列表
				searchResults: [],
				// 搜索历史
				historyList: []
			};
		},
		onLoad() {
			this.historyList = JSON.parse(uni.getStorageSync('kw') || '[]')
		},
		
		methods:{
			input(e){
				// console.log(e)
				
				// 防抖，防止连续获取用户输入的内容
				clearTimeout(this.timer)
				this.timer = setTimeout(()=>{
					// console.log(e)
					this.kw = e
					
					// 
					this.getSearchList()
				},500)
			},
			// 
			async getSearchList(){
				if(this.kw.length === 0){
					this.searchResults = []
					return
				}
				
				const {data:res} = await uni.$http.get('/goods/qsearch', {query: this.kw})
				if(res.meta.status !== 200) return uni.$showMsg()
				this.searchResults = res.message
				
				this.saveSearchHistory()
			},
			gotoDetail(item){
				console.log(item.goods_id)
				uni.navigateTo({
					url:'/subpkg/goods_detail/goods_detail?goods_id='+item.goods_id
				})
			},
			// 
			saveSearchHistory(){
				// this.historyList.push(this.kw)
				// 去重
				const set = new Set(this.historyList)
				set.delete(this.kw)
				set.add(this.kw)
				this.historyList = Array.from(set)
				console.log(set)
				
				// 对搜索历史数据进行持久化存储
				uni.setStorageSync('kw', JSON.stringify(this.historyList))
			},
			clean(){
				this.historyList = []
				uni.setStorageSync('kw', '[]')
			},
			// computed: {
			// 	histories() {
			// 		return [...this.historyList].reverse() 
			// 	}
			// },
			
			gotoGoodsList(kw){
				uni.navigateTo({
					url: '/subpkg/goods_list/goods_list?query=' + kw
				})
			}
		}
	}
</script>

<style lang="scss">

	.search-box{
		position: sticky;
		top: 0;
		z-index: 999;
	}
	// 套进来就不显示了，奇怪吧，感谢弹幕
	.sugg-list {
		padding: 0 16px;
	}
	.sugg-item {
		display: flex;
		justify-content: space-between;
		align-items: center;
		font-size: 12px;
		padding: 10px 0;
		border-bottom: 1px solid #efefef;
		}	
	.goods-name{

				white-space: nowrap;
				overflow: hidden;
				text-overflow: ellipsis;
			}
			// 
	.history-box{
			padding: 0 12px;
		.history-title{
			display: flex;
			justify-content: space-between;
			height:40px;
			align-items: center;
			font-size: 12px;
			border-bottom: 1px solid #efefef;
		}
		.history-list{
			display: flex;
			flex-wrap: wrap;
			.uni-tag {
				margin-top: 6px;
				margin-right: 6px;
				
			}
		}
	}
</style>
